I have volumes 1-16 and volume 18 of American Heritage Illustrated History of the United States that I will trade for 12 credits / OBO. Books are in excellent/perfect condition. The ISBN for volume 1 is 0-945260-01-6 if you want to check it out to get a better idea of what I have.. Would be great for students or teachers interested in the history of the US. Make me an offer!!